Hastelloy C-276 ANSI Pump Parts for Mixed Acid and Severe Oxidizing Chemical Service
Hastelloy C-276 (ASTM A494 Grade CW12MW) is the most versatile nickel-chromium-molybdenum alloy for severe corrosive chemical pump applications. When your process stream contains mixed acids, oxidizing chlorides, or fluctuating pH conditions that would destroy stainless steel within hours, Hastelloy C-276 replacement pump parts deliver reliable long-term performance.
Chemical Environments Where Hastelloy C-276 Excels
The unique chemistry of Hastelloy C-276 — approximately 54% Nickel, 16% Molybdenum, 15.5% Chromium, 5% Iron, 4% Tungsten — provides exceptional resistance to both oxidizing and reducing media. This dual capability makes it the universal solution for unpredictable or mixed chemical streams.
⚠️ Quality & Compliance Assurance
All pumps and components from ANSI Pumps Pro are manufactured to ASME B73.1 dimensional specifications. Each shipment includes certified Material Test Reports (MTRs), CMM dimensional inspection reports, and hydrostatic test certificates (1.5× MAWP). 100% dimensional interchangeability guaranteed. Full material traceability from heat number to your receiving dock.
| Chemical Environment | Max Temperature | Why C-276 Works |
|---|---|---|
| Sulfuric Acid (H₂SO₄) — All concentrations | Up to 100°C (212°F) | High Mo content resists reducing acid attack |
| Hydrochloric Acid (HCl) — <20% | Up to 60°C (140°F) | Ni-Cr-Mo matrix immune to chloride pitting |
| Phosphoric Acid (H₃PO₄) — Wet process | Up to 120°C (248°F) | Resists fluoride and chloride impurities in wet-process acid |
| Wet Chlorine Gas | Up to 80°C (176°F) | Outstanding resistance — no minimum moisture requirement |
| Ferric Chloride (FeCl₃) | Up to 80°C (176°F) | Resists severe pitting — benchmark test for alloy performance |
| Mixed Acid Streams (HNO₃ + HCl + H₂SO₄) | Up to 90°C (194°F) | Handles both oxidizing (HNO₃) and reducing (HCl) species simultaneously |
| Chlorine Dioxide (ClO₂) — Pulp bleaching | Up to 80°C (176°F) | Preferred alloy for pulp & paper bleach plant service |
Hastelloy C-276 vs. Alternatives — When to Pay the Premium
| Alloy | Reducing Acids (HCl, H₂SO₄) | Oxidizing Media (HNO₃, Wet Cl₂) | Chloride Pitting | PREN | Relative Cost |
|---|---|---|---|---|---|
| 316SS (CF8M) | Fails rapidly | Fair | Poor below 60°C | 24–26 | $ |
| CD4MCuN (Duplex) | Fails (ferrite attack) | Good | Excellent | 34–38 | $$ |
| Titanium Grade 2 | Fails rapidly | Excellent | Excellent below 80°C | ≥ 30 | $$ |
| Alloy 20 (CN7M) | Good (H₂SO₄ focused) | Moderate | Moderate | ≥ 28 | $$$ |
| Hastelloy C-276 | Excellent — all conc. | Excellent | Excellent | ≥ 64 | $$$$ |
Available Hastelloy C-276 Pump Components
We cast and machine the full range of Goulds 3196 and Durco Mark III interchangeable replacement parts in ASTM A494 Grade CW12MW (Hastelloy C-276 equivalent). All dimensions and tolerances strictly adhere to ASME B73.1 standards, ensuring 100% dimensional interchangeability:
- Impellers (Item 101) — Open vane, reverse vane designs available for all frame sizes
- Casings (Item 100) — Volute type, all ANSI frame sizes from STX through XLT-X
- Shafts & Shaft Sleeves (Item 122) — Precision-ground journals with full traceability
- Stuffing Box Covers and Seal Chambers — Including Item 184, all frame sizes
- Bearing Housings (Item 228) — Power end components for 24/7 continuous service
Lead Time & Rush Order Availability
Hastelloy C-276 castings require controlled foundry conditions due to the alloy’s tight chemistry tolerances. Here’s what to expect:
- 📦 Standard Lead Time: 6–10 weeks for C-276 cast and machined parts — manufactured with full EN 10204 3.1 MTR, PMI, and dimensional inspection
- ✅ Stock Availability: Select C-276 impellers and casings for common Goulds 3196 frame sizes may be in stock — contact us for current inventory
- 🔥 Emergency Rush Orders: 3–4 weeks — Request expedited alloy procurement and foundry allocation
Disclaimer: ANSI Pumps Pro is an independent aftermarket manufacturer. Hastelloy is a registered trademark of Haynes International, Inc. Goulds and 3196 are registered trademarks of ITT Corporation. Durco and Mark III are registered trademarks of Flowserve Corporation. All OEM part numbers and trademarks are used for compatibility reference only. We are not affiliated with or endorsed by any of these manufacturers.
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